CENOCCELIUS.— MEGISCHUS. 419 



a depression on the front of the mesonotum, with a keel in its centre ; the sides in front 

 of the scutellum impunctate. Propleuree excavated, punctured ; mesopleurse impunctate ; 

 metapleune rugosely punctured ; a hollow on the mesopleurse next the metapleurse. 

 Abdomen twice the length of the thorax, shining, impunctate. Wings : the second 

 cubital cellule not much longer than broad, narrowed at the apex, the cubitus carved 

 along it ; the recurrent nervure interstitial. The middle cloud commences at the base 

 of the stigma and extends to near its apex ; the hind wings have only a central cloud. 



Fam. STEPHANIDiE. 



This family has been included by many authors among the Evaniidse, from which, 

 however, it differs in having the abdomen attached to the extremity of the metathorax. 

 The presence of a distinct costal cellule, the globose, tuberculated head, the very thin 

 antenna?, the toothed posterior femora, and the short 3-jointed tarsi (in the female) 

 render the identification of the genus an easy matter. 



MEGISCHUS. 



Megischus, Brulle, Hist. Nat. Ins. Hymen, iv. p. 537 (1846). 



I am inclined to regard Megischus as congeneric with Stephanus, Jurine ; but, as the 

 species are somewhat confused, I prefer to place those here described in Megischus, to 

 which in its restricted meaning they actually belong. 



Megischus has a wide range over the globe, but comparatively few species have been 

 described. The species are, I think, very variable, but as a very limited number of 

 specimens have been examined, it is not possible to say to what extent the variation 

 extends. 



1. Megischus annulator. (Tab. XVIII. figg. 7 <j , 8 $ .) 



Megischus annulator, Brulle, Hist. Nat. Ins. Hymen, iv. p. 539, t. 40. fig. 5 ; Sichel, Ann. Soc. 



Ent. Ft. 1865, p. 482, t. 10. figg. 6, a, b, c \ 

 Bothrioceros americanus, Sichel, Ann. Soc. Ent. Fr. 1860, p. 701 2 . 

 Megischus americanus, Sichel, Ann. Soc. Ent. Fr. 1865, p. 480 3 . 



Hab. Guatemala, San Geronimo, El Eeposo 800 feet {Champion). — Brazil 1 2 3 . 



A variable species in colour, sculpture, and size. In the Guatemalan specimens the 

 four anterior legs are brown in the female, of a brighter and redder tint in the male, the 

 latter sex having also the posterior tibiae and tarsi red. The teeth on the hinder femora 

 vary in number and size. As the male has not been fully described, I give a detailed 

 description of it : — 



Head coarsely, transversely rugosely striolated, except behind the eyes, where it is 



3hh2 



